Process of treating palo-amarillo and similar gums.



UNITED STATES PATENT OFFICE.

GEORGE OF BROOKLYN, NEW YORK.

PROCESS OF TREATING PALO-AMARILLO AND SIMILAR G'UMS.

1,024,178. No Drawing.

Specification of Letters Patent. Application filed April 29, 1910. Serial No. 558,450.

' Patented Apr. 23, 1912.

To all whom it may concern: Be it known that I, GEORGE B. BRADSHAW, a citizen of the United States, residing at Brooklyn in the county of Kings and State of. New. ork, have invented certain new and useful Improvements in Processes of Treatin Palo-Amarillo and Similar Gums,.

of whic the following is a full, clear, and

, exact description, such as will enable others yielding a gum of a similar nature, so that commercial value. a

One of the objects of this invention is to provide a practical and economical method of extracting resin from rubber gum of the above nature, that -will be simple and inexpensiveto perform.

Another object of the invention is to provide a process of the above nature that will be more efiicient than. those heretofore em-.

the ingredientsof the same may be made of ploged in extracting the resin from the gum, an

It is tobe noted in which the resulting gum will be of a finer quality and possess greater elastic propertiess A further object of this invention is to provide a process of the above nature that Ina "becarriedout more expeditiously and wit out certain disagreeablefeatures here tofore coincident with processes of this na-- ture. i

Other objects will bein part obvious and in art hereinafter pointed out.

he invention accordingly consists inthe several steps and the relation and order of one or more of such steps with relationto each of the others thereof, which will be exemplified in the hereinafter disclosed process, and the scope of. the a plication of which will be indicated int e following claims. I 7

that {the latex and crude gunr obtained from the-zpalo amarillotree,

or trees of a similar nature, have hitherto been commercially unprofitable, principally because the ingredients thereof could not be economically separated and obtained in a condition in which they are directly available in the rubberindustry and for indus- I trial purposes wheresuch lastics are essential. The process hereina ter' disclosed accomplishes the desired separation .of the rubber and resin and at the same time so improves the quality of the same that they are directly commercially available.

In practising this process either the latex "or the coagulated gum therefrom may be used; if the former, it is first coagulated by any well known methods forming a crude This crude coagulated mixture, of rubber and resin is partially dried, but not entirel so, about ten per cent. of water bein le t. .in the gum for reasons hereinafter set o The. partial drying is for the purpose of rth.

preventing the dilution of the solvents and precipitates used and interference with the action of substances added to improve the properties of the rubber product, whileif all the water were dried out the gum would become tifghtly glued to the paddles of the stirrers o the machine. The drying is preferably done in suitable apparatus n which the latter operations may be performed. Having thus partially dried the crude gum, a solvent of both the rubber, and resin C011:-

tained therein is added and thoroughly incorporated with the same until a homogene ous paste is produced. This solvent may be one or more of the solvents for rubber,

such as petroleum-ether, naphtha, benzin, gasolene, benzol, toluene, ch oroform, can bon disulfid, carbon tetra-chlorid, etc. Hav

coagulated mixture of rubber and resin.

ing produced this paste the next step is to add solvent already used and of holding in solution all the ingredients other than the rubher, .which latter is precipitated. The reagents employed for this purpose may be one or more of the following :methyl alcohol, ethyl .alcohol, acetone, ethyl acetate,

'methyl acetate, etc. The operation described may be facilitatedby heat and agitation, using a closed vessel to prevent loss of the volatile reagents. The resin, con

a reagent capable of mixing with the tainin solution is now drawn off from the precipltated rubber, and if necessary, the

latter is again treated with a resin solvent.

To the residual-rubber, still containing some 5 of the solvent, is now added a substance,or substances, which have the properties of increasing the stiffness of the rubber and overcoming its charac teristic and objectionable stickiness; for example, from 1% toadvantageous for the reason that the mixture is made while the rubber is still soft from the action of the solvents. After incorporating the additions specified the remaining solvents are displaced by adding water and the resulting Wet rubber removed from themachine, sheeted and dried on trays. If the rubber were entirely dried. at this stage, orany previous'time during the process before removing from the machine, it would stick to the paddles and have to be tediously removed therefrom. It i is therefore advisable to always have some water or solvent present. The solution containin the resin is treated in a suitable still for and separation of the volatile reagents em loyed and for obtaining the residual resin.

he latter may be subjected to the action" of certain bleaching reagents, such as ch10- rid of lime or bichromate of potash before the complete removal of the volatile-reagents, the object being the production of a purified, colorless or white resin which has a commercial value for many purposes.

It will thus be seen that this invention provides a practical and efiicient process for the treatment of certain rubber gums, and more particularly the gums above mentioned. It will also benoted that the process may be carried out with a single, simple and inexpensive form of apparatus, and in less time and with less trouble and ex pense than heretofore.

As many changes could be made in carrying out the above process Without departing fromthe scope of the invention, it is intended that all matter contained in the above description shall be interpreted as 50 illustrative and not in a limiting sense. It

is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the'invention,

ployment as above outlined isv especially the recovery which, as a matter of language, might be said to fall therebetween.

Having thus described my invention,what I .claim .as new and desire to secure by Letters Patent is: I I

1. The herein described process of extracting resin from rubber gum, which consists in coagulating the latex of the gum, removing at least of'water therefrom, adding to the gum a solvent for the rubber and resin therein, precipitating the rubber, and separating the same from the solvent.

2. The herein described process of extracting resin from rubber gums, which consists in treating the same with a solvent for both the rubber and resin, precipitating the rubber, separating the rubber from'the solvent, and adding to the rubber ingredients to change its texture, whereby the same is converted into a commercial article.-

3. The herein described process of extracting resin from rubber ums, which consists in treating the gum wit a solvent for both the rubber and the resin, precipitatingthe rubber therefrom, drawing off the solvent,

adding to the precipitate calcined magnesia" for changing its texture, whereby the same is converted into a commercial article.

4:. The herein described process of extracting resin from rubber gums which consists in partially drying the gum until about 10% of water remains, adding to the gum a solvent for the. rubber and resin, precipitating the rubber, and separating the same from the solvent in the presenceof water.

5. The herein described process of extracting resin from rubber which consists in treating the same with a solvent for both the rubber and the resin, precipitating the rubber, washing the same free from all solvent in the presence of water, and adding to the rubber an ingredient to change its texture whereby the same is converted into a commercial article.

6. The herein described process of treating rubber, which consist-s in partially dry ing the same, adding a solvent thereto to entirely dissolve the gum, precipitating the rubber, washing the. same free from allsolvent in the presence of water, and then adding thereto certain ingredients to change its texture.

7. The herein described .process of treating rubber, which consists in adding a hydrocarbon or hydrocarbon derivative thereto to dissolve the mass, precipitating the rubber from the solution by the addition of alkyl compound, separating the precipitate from the solution, and suitably treating the same by' the addition of an alkaline substance to change its texture.

8. The herein described process of treating rubber gum, which consists in removing substantially all of the Water therefrom within a drier, adding a solvent to dissolve an resin, adding reagents to the resin tothe precipitating the rubber in the drying and treating the same to reduce it to 10 solutlon y the addition of an alkyl oom- :ajcommercial article. pound, withdrawing the solution and distil- In testimony whereof I aflix my signature, lin the same to recover volatile reagents in'the presence of two witnesses.

GEORGE B. BRADSHAW. Witnesses:

PAUL A. BLAIR, LnoNAnn' A. WA'TsoN.

purify and bleach the same, addingan alkaline ingredient to the precipitated rubber to increase its stiffness, removing the precipitate from the apparatus, and thoroughly Oopiei'qt thin patent may be obtained for in cent: each, by addressing the commissioner 9! Patents,

Washington, D. 0."

It is hereby certified that in Letters PatentlNo. 1,024,178, granted April 23,1912, upon the'application of George B. Bradshaw, of Brooklyn, New York, for an improvement in Processes of Treating Palo-Amarillo andSimilar Gums, an error appears in the printed specification requiring correction as follows; Page 1, line 76, for the word precipitates read precz'pz'tants; and that-the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent-Office.- I

Signed and sealed this 14th day of May, D., 191 [SEAL] i o. o. BII QLINGS,

Acting Commissioner of Patents.

an resin, adding reagents to the resin tothe precipitating the rubber in the drying and treating the same to reduce it to 10 solutlon y the addition of an alkyl oom- :ajcommercial article. pound, withdrawing the solution and distil- In testimony whereof I aflix my signature, lin the same to recover volatile reagents in'the presence of two witnesses.

GEORGE B. BRADSHAW. Witnesses:

PAUL A. BLAIR, LnoNAnn' A. WA'TsoN.

purify and bleach the same, addingan alkaline ingredient to the precipitated rubber to increase its stiffness, removing the precipitate from the apparatus, and thoroughly Oopiei'qt thin patent may be obtained for in cent: each, by addressing the commissioner 9! Patents,

Washington, D. 0."

It is hereby certified that in Letters PatentlNo. 1,024,178, granted April 23,1912, upon the'application of George B. Bradshaw, of Brooklyn, New York, for an improvement in Processes of Treating Palo-Amarillo andSimilar Gums, an error appears in the printed specification requiring correction as follows; Page 1, line 76, for the word precipitates read precz'pz'tants; and that-the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent-Office.- I

Signed and sealed this 14th day of May, D., 191 [SEAL] i o. o. BII QLINGS,

Acting Commissioner of Patents.

Correction in Letters Patent No. 1,024,178.

I It is hereby certified that in Letters Patent No. 1,024,178, granted April 23, 1912, upon the application of George B. Bradshaw, of Brooklyn, New York, for an Similar Gums,

improvement in Processes of Treating Palo-Amarillo and an error appears in the printed specification requiring correction as follows. Page 1, line 76,

for the Word precipitates read preczpz'tants; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Otfice.

Signed and sealed this 14th day of May, A. D., 1912.

C. C. BILLINGS,

Acting Commissioner of Patents.

[ SEAL. 

